1 /* 2 * Copyright (c) 2003, 2006, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 # include "incls/_precompiled.incl" 26 # include "incls/_constMethodOop.cpp.incl" 27 28 // Static initialization 29 const u2 constMethodOopDesc::MAX_IDNUM = 0xFFFE; 30 const u2 constMethodOopDesc::UNSET_IDNUM = 0xFFFF; 31 32 // How big must this constMethodObject be? 33 34 int constMethodOopDesc::object_size(int code_size, 35 int compressed_line_number_size, 36 int local_variable_table_length, 37 int checked_exceptions_length) { 38 int extra_bytes = code_size; 39 if (compressed_line_number_size > 0) { 40 extra_bytes += compressed_line_number_size; 41 } 42 if (checked_exceptions_length > 0) { 43 extra_bytes += sizeof(u2); 44 extra_bytes += checked_exceptions_length * sizeof(CheckedExceptionElement); 45 } 46 if (local_variable_table_length > 0) { 47 extra_bytes += sizeof(u2); 48 extra_bytes += 49 local_variable_table_length * sizeof(LocalVariableTableElement); 50 } 51 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; 52 return align_object_size(header_size() + extra_words); 53 } 54 55 56 // linenumber table - note that length is unknown until decompression, 57 // see class CompressedLineNumberReadStream. 58 59 u_char* constMethodOopDesc::compressed_linenumber_table() const { 60 // Located immediately following the bytecodes. 61 assert(has_linenumber_table(), "called only if table is present"); 62 return code_end(); 63 } 64 65 u2* constMethodOopDesc::checked_exceptions_length_addr() const { 66 // Located at the end of the constMethod. 67 assert(has_checked_exceptions(), "called only if table is present"); 68 return last_u2_element(); 69 } 70 71 u2* constMethodOopDesc::localvariable_table_length_addr() const { 72 assert(has_localvariable_table(), "called only if table is present"); 73 if (has_checked_exceptions()) { 74 // If checked_exception present, locate immediately before them. 75 return (u2*) checked_exceptions_start() - 1; 76 } else { 77 // Else, the linenumber table is at the end of the constMethod. 78 return last_u2_element(); 79 } 80 } 81 82 83 // Update the flags to indicate the presence of these optional fields. 84 void constMethodOopDesc::set_inlined_tables_length( 85 int checked_exceptions_len, 86 int compressed_line_number_size, 87 int localvariable_table_len) { 88 // Must be done in the order below, otherwise length_addr accessors 89 // will not work. Only set bit in header if length is positive. 90 assert(_flags == 0, "Error"); 91 if (compressed_line_number_size > 0) { 92 _flags |= _has_linenumber_table; 93 } 94 if (checked_exceptions_len > 0) { 95 _flags |= _has_checked_exceptions; 96 *(checked_exceptions_length_addr()) = checked_exceptions_len; 97 } 98 if (localvariable_table_len > 0) { 99 _flags |= _has_localvariable_table; 100 *(localvariable_table_length_addr()) = localvariable_table_len; 101 } 102 } 103 104 105 int constMethodOopDesc::checked_exceptions_length() const { 106 return has_checked_exceptions() ? *(checked_exceptions_length_addr()) : 0; 107 } 108 109 110 CheckedExceptionElement* constMethodOopDesc::checked_exceptions_start() const { 111 u2* addr = checked_exceptions_length_addr(); 112 u2 length = *addr; 113 assert(length > 0, "should only be called if table is present"); 114 addr -= length * sizeof(CheckedExceptionElement) / sizeof(u2); 115 return (CheckedExceptionElement*) addr; 116 } 117 118 119 int constMethodOopDesc::localvariable_table_length() const { 120 return has_localvariable_table() ? *(localvariable_table_length_addr()) : 0; 121 } 122 123 124 LocalVariableTableElement* constMethodOopDesc::localvariable_table_start() const { 125 u2* addr = localvariable_table_length_addr(); 126 u2 length = *addr; 127 assert(length > 0, "should only be called if table is present"); 128 addr -= length * sizeof(LocalVariableTableElement) / sizeof(u2); 129 return (LocalVariableTableElement*) addr; 130 }